(19)

(11)

EP 0 517 882 A1

(12)

(43) Date of publication: 16.12.1992 Bulletin 1992/51 (21) Application number: 92902397.0 (22) Date of filing: 02.01.1992

(51) International Patent Classification (IPC):  C23C 4/ 12( . ) C23C 4/ 18( . ) (86) International application number: PCT/GB1992/000004 (87) International publication number: WO 1992/012272 (23.07.1992 Gazette 1992/19)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 02.01.1991 US 19910636862 (71) Applicants: OSPREY METALS LIMITED Millands Neath West Glamorgan SA11 1NJ (GB) OLIN CORPORATION Stamford Connecticut 06904 (US)	(72) Inventors: CHESKIS, Harvey, P. North Haven, CT 06473 (US) WATSON, W., Gary Cheshire, CT 06410 (US) COOMBS, Jeffrey Stuart Cimla, West Glamorgan SA11 1DJ (GB) CHESNEY, Peter, Frank Duncanville, TX 75137 (US) (74) Representative: Wilson, Nicholas Martin  WITHERS & ROGERS 4 Dyer's Buildings Holborn London EC1N 2JT London EC1N 2JT (GB)